Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden
A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. The study aimed to evaluate (1) the nature of climate changes that forced the...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hdl.handle.net/1956/2494 https://doi.org/10.1191/0959683604hl756rp |
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ftunivbergen:oai:bora.uib.no:1956/2494 2023-05-15T18:40:42+02:00 Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden Hammarlund, Dan Velle, Gaute Wolfe, Brent B. Edwards, Thomas W. D. Barnekow, Lena Bergman, Jonas Holmgren, Sofia Lamme, Sara Snowball, Ian Wohlfart, Barbara Possnert, Göran 2004 application/pdf https://hdl.handle.net/1956/2494 https://doi.org/10.1191/0959683604hl756rp eng eng SAGE urn:issn:0959-6836 https://hdl.handle.net/1956/2494 https://doi.org/10.1191/0959683604hl756rp Holocene palaeoecology Alpine tree-limit dynamics Lake sediments Lacustrine nutrient cycling Stable isotope geochemistry Chironomidae Environmental magnetism Sweden VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Peer reviewed Journal article 2004 ftunivbergen https://doi.org/10.1191/0959683604hl756rp 2023-03-14T17:44:02Z A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. The study aimed to evaluate (1) the nature of climate changes that forced the late-Holocene lowering of altitudinal tree limit in the region, the timing of which is known from prior studies based on radiocarbon dating of subfossil wood, and (2) the impact of these vegetational changes on an aquatic ecosystem. Arboreal pollen and plant macrofossil data confirm the persistence of trees in the lake catchment at least from c. 9700 cal. BP until c. 3700 cal. BP. Although growing-season temperature is commonly believed to be the dominant factor driving boreal forest tree-limit variations in the region, a chironomid-based reconstruction of mean July air temperature suggests that local deforestation during the late Holocene was not accompanied by a significant cooling. The tree-limit retreat was more likely caused by increasing effective moisture and declining length of the growing season. The ecohydrological response of Lake Spaime to this combination of climate and vegetational changes included a decline in primary productivity, as indicated by an abrupt decrease in sediment organic matter content, while associated increases in organic 613C, 615N and C/N point to diminished fluxes and altered balance of catchment derived nutrients following deforestation. The decline in aquatic productivity is also marked by a distinct change in the mineral magnetic properties, from a high magnetic concentration assemblage dominated by fine-grained magnetite of biogenic origin to one dominated by background levels of coarse-grained detrital magnetite. Article in Journal/Newspaper Tundra University of Bergen: Bergen Open Research Archive (BORA-UiB) The Holocene 14 6 862 876 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Holocene palaeoecology Alpine tree-limit dynamics Lake sediments Lacustrine nutrient cycling Stable isotope geochemistry Chironomidae Environmental magnetism Sweden VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
spellingShingle |
Holocene palaeoecology Alpine tree-limit dynamics Lake sediments Lacustrine nutrient cycling Stable isotope geochemistry Chironomidae Environmental magnetism Sweden VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 Hammarlund, Dan Velle, Gaute Wolfe, Brent B. Edwards, Thomas W. D. Barnekow, Lena Bergman, Jonas Holmgren, Sofia Lamme, Sara Snowball, Ian Wohlfart, Barbara Possnert, Göran Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden |
topic_facet |
Holocene palaeoecology Alpine tree-limit dynamics Lake sediments Lacustrine nutrient cycling Stable isotope geochemistry Chironomidae Environmental magnetism Sweden VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
description |
A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. The study aimed to evaluate (1) the nature of climate changes that forced the late-Holocene lowering of altitudinal tree limit in the region, the timing of which is known from prior studies based on radiocarbon dating of subfossil wood, and (2) the impact of these vegetational changes on an aquatic ecosystem. Arboreal pollen and plant macrofossil data confirm the persistence of trees in the lake catchment at least from c. 9700 cal. BP until c. 3700 cal. BP. Although growing-season temperature is commonly believed to be the dominant factor driving boreal forest tree-limit variations in the region, a chironomid-based reconstruction of mean July air temperature suggests that local deforestation during the late Holocene was not accompanied by a significant cooling. The tree-limit retreat was more likely caused by increasing effective moisture and declining length of the growing season. The ecohydrological response of Lake Spaime to this combination of climate and vegetational changes included a decline in primary productivity, as indicated by an abrupt decrease in sediment organic matter content, while associated increases in organic 613C, 615N and C/N point to diminished fluxes and altered balance of catchment derived nutrients following deforestation. The decline in aquatic productivity is also marked by a distinct change in the mineral magnetic properties, from a high magnetic concentration assemblage dominated by fine-grained magnetite of biogenic origin to one dominated by background levels of coarse-grained detrital magnetite. |
format |
Article in Journal/Newspaper |
author |
Hammarlund, Dan Velle, Gaute Wolfe, Brent B. Edwards, Thomas W. D. Barnekow, Lena Bergman, Jonas Holmgren, Sofia Lamme, Sara Snowball, Ian Wohlfart, Barbara Possnert, Göran |
author_facet |
Hammarlund, Dan Velle, Gaute Wolfe, Brent B. Edwards, Thomas W. D. Barnekow, Lena Bergman, Jonas Holmgren, Sofia Lamme, Sara Snowball, Ian Wohlfart, Barbara Possnert, Göran |
author_sort |
Hammarlund, Dan |
title |
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden |
title_short |
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden |
title_full |
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden |
title_fullStr |
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden |
title_full_unstemmed |
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden |
title_sort |
palaeolimnological and sedimentary responses to holocene forest retreat in the scandes mountains, west-central sweden |
publisher |
SAGE |
publishDate |
2004 |
url |
https://hdl.handle.net/1956/2494 https://doi.org/10.1191/0959683604hl756rp |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
urn:issn:0959-6836 https://hdl.handle.net/1956/2494 https://doi.org/10.1191/0959683604hl756rp |
op_doi |
https://doi.org/10.1191/0959683604hl756rp |
container_title |
The Holocene |
container_volume |
14 |
container_issue |
6 |
container_start_page |
862 |
op_container_end_page |
876 |
_version_ |
1766230112323239936 |